NPPES file of Aug 9, 2026

Doctors and health care providers in San Mateo, CA

3,909 individual NPPES records list a practice address in San Mateo, 54th of 812 California cities. The largest group is behavior technician: 848, 22% of the city's records, against 18% across California. Page 18 of 79.

CMS NPPES registry, file of Aug 9, 2026 · method · Verify with CMS →

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

San Mateo in California

  • Rank in California54th of 812 cities by records
  • Share of the state0.4% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups35.7% of all records

Compared with California as a whole, San Mateo has 2.5× the state's share of psychiatry physician records and 0.57× its share of family medicine physician records.

Providers in San Mateo, alphabetically

  1. Michelle Decorte, R.N., L.C.S.W.Clinical Social Worker1811946577
  2. Brianna DeePhysician Assistant1396120770
  3. Genevieve Dee, D.D.SGeneral Practice Dentistry1013035930
  4. Henry Dee, DMDGeneral Practice Dentistry1710185616
  5. Jennifer Deem, FNPFamily Nurse Practitioner1922455971
  6. Sarah DehavenEmergency Registered Nurse1497546238
  7. Maia DehlingerNurse Practitioner1285706390
  8. Jason DeibelCommunity Health Registered Nurse1497933642
  9. Bouke Dejong, MDInfectious Disease Physician1366524308
  10. Susan DekomAddiction (Substance Use Disorder) Counselor1457590770
  11. Maria Del Rio, PH.D.Health Service Psychologist1043576622
  12. Noeli Del RioBehavior Technician1811576770
  13. Dann Matthew Dela CruzBehavior Technician1710847322
  14. Miguel Deleon, DMDGeneral Practice Dentistry1306465190
  15. Mary Delgado, RNRegistered Nurse1801075205
  16. Noelia Delgado HuertasStudent in an Organized Health Care Education/Training Program1720492556
  17. Marcos Delgado MartinezBehavior Technician1447149323
  18. Peter Dell, M.D.Psychiatry Physician1699806059
  19. Justine Della Fave, MSN, CNM, WHNP-BCWomen's Health Nurse Practitioner1487108957
  20. Katie Dellamaria, RN, PHN, MSNRegistered Nurse1033341227
  21. Toni DemarcoMarriage & Family Therapist1891826038
  22. Kristin DempseyMarriage & Family Therapist1346371655
  23. Siyun DengBehavior Technician1891396149
  24. Elisabeth Denker, RN FNP-CFamily Nurse Practitioner1235363102
  25. Razan DennawiBehavior Analyst1932556628
  26. Ananya DeolBehavior Technician1205566973
  27. Megan Depuy, MBA, MS, CCC-SLPSpeech-Language Pathologist1265970677
  28. Melisa DerasBehavior Analyst1912372608
  29. Mika Derynck, M.D.Specialist1477914307
  30. Shalaka Desai, DDSGeneral Practice Dentistry1427621341
  31. Gardy Desroches, RNRegistered Nurse1093408130
  32. Serena Deverich, NPAdult Health Nurse Practitioner1902513559
  33. Geeta DevjaniMarriage & Family Therapist1093097297
  34. Endiya DevoeBehavior Technician1346075603
  35. Cameron Dezham, D.D.S.General Practice Dentistry1093926677
  36. Anish Dhamija, MDBehavioral Neurology & Neuropsychiatry Physician1063946275
  37. Gagandeep DhillonBehavior Technician1043883879
  38. Andrew Dias, DCChiropractor1487533139
  39. Amanda DiazBehavior Technician1023870946
  40. Cristina Diaz, FNPFamily Nurse Practitioner1326859612
  41. Deborah Diaz, LCSWClinical Social Worker1043347362
  42. Ericka DiazClinical Social Worker1750635108
  43. Shannon DiazCounselor1740673441
  44. Sonia DiazSpeech-Language Pathologist1649784745
  45. Erika Diaz RuedaBehavior Technician1649993999
  46. Marina Diaz-Bados, RNRegistered Nurse1831378223
  47. Daniela Diaz-ProschBehavior Technician1366114597
  48. Grace Dible, CNMAdvanced Practice Midwife1114525789
  49. Elizabeth DicksonStudent in an Organized Health Care Education/Training Program1457808149
  50. Dirk Diefendorf, M.D.Sports Medicine (Neuromusculoskeletal Medicine) Physician1467559443

The largest California cities

  1. Los Angeles69,537
  2. San Diego52,937
  3. San Francisco38,143
  4. Sacramento33,083
  5. San Jose20,925

All of California →

How to read this directory

San Mateo, California appears in the CMS National Plan and Provider Enumeration System with 3,909 registered healthcare providers spanning 25 or more distinct NUCC-taxonomy specialties. This count includes every individual clinician who has applied for an NPI and listed a practice address in San Mateo - physicians, dentists, nurse practitioners, physician assistants, chiropractors, physical therapists, optometrists, psychologists, podiatrists, and every other credentialed provider type CMS tracks. It does not measure hospital beds, urgent-care capacity, or whether a given clinic is accepting new patients; it measures the pool of professionals with current NPI enrollment and a San Mateo practice location on file. Every figure is drawn from the federal National Provider Identifier Registry (CMS NPPES) - more than 7 million providers, maintained since May 2007, with 2024 Medicare Part D data, and, according to CMS, can be searched, compared, and traced in our methodology.

The provider mix in San Mateo is weighted toward Behavior Technician (848 clinicians, followed by Marriage & Family Therapist with 348 and Behavior Analyst with 200). That distribution reflects how NPPES records specialty: providers self-select a primary taxonomy code, so a family physician who also practices geriatrics will show up under whichever NUCC code they registered first. Relative to California's population, San Mateo reports roughly 10 providers per 100,000 residents using the state-level denominator, which is a rough proxy rather than a precise access-to-care measurement; the true catchment area of any {cityName} clinician extends beyond the municipal boundary.

For San Mateo patients, this directory is most useful as a starting shortlist. Important: PlainDoctor is a directory of publicly available CMS government data, not a review site, a ranking, or medical advice. NPPES data is self-reported and refreshed monthly; call the practice directly to confirm the provider is still there, accepts your insurance, and is taking new patients.

For informational purposes only; this directory is not medical advice and not a substitute for checking a license. See also: how to find a doctor and how to verify one.

Common questions

How many doctors are in San Mateo, CA?

There are 3,909 registered healthcare providers in San Mateo, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in San Mateo?

The most common specialties in San Mateo are Behavior Technician, Marriage & Family Therapist, Behavior Analyst, Mental Health Counselor, Clinical Social Worker. Behavior Technician has the most providers with 848.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov). Records are self-reported registrations, not licenses.

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.